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/*

 *      connector.h

 *

 * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>

 * All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#ifndef __CONNECTOR_H

#define __CONNECTOR_H

#include <asm/types.h>

#define CN_IDX_CONNECTOR                0xffffffff

#define CN_VAL_CONNECTOR                0xffffffff

/*

 * Process Events connector unique ids -- used for message routing

 */

#define CN_IDX_PROC                     0x1

#define CN_VAL_PROC                     0x1

#define CN_IDX_CIFS                     0x2

#define CN_VAL_CIFS                     0x1

#define CN_W1_IDX                       0x3     /* w1 communication */

#define CN_W1_VAL                       0x1

#define CN_IDX_V86D                     0x4

#define CN_VAL_V86D_UVESAFB             0x1

#define CN_NETLINK_USERS                5

/*

 * Maximum connector's message size.

 */

#define CONNECTOR_MAX_MSG_SIZE          16384

/*

 * idx and val are unique identifiers which

 * are used for message routing and

 * must be registered in connector.h for in-kernel usage.

 */

struct cb_id {

        __u32 idx;

        __u32 val;

};

struct cn_msg {

        struct cb_id id;

        __u32 seq;

        __u32 ack;

        __u16 len;              /* Length of the following data */

        __u16 flags;

        __u8 data[0];

};

/*

 * Notify structure - requests notification about

 * registering/unregistering idx/val in range [first, first+range].

 */

struct cn_notify_req {

        __u32 first;

        __u32 range;

};

/*

 * Main notification control message

 * *_notify_num         - number of appropriate cn_notify_req structures after

 *                              this struct.

 * group                - notification receiver's idx.

 * len                  - total length of the attached data.

 */

struct cn_ctl_msg {

        __u32 idx_notify_num;

        __u32 val_notify_num;

        __u32 group;

        __u32 len;

        __u8 data[0];

};

#ifdef __KERNEL__

#include <asm/atomic.h>

#include <linux/list.h>

#include <linux/workqueue.h>

#include <net/sock.h>

#define CN_CBQ_NAMELEN          32

struct cn_queue_dev {

        atomic_t refcnt;

        unsigned char name[CN_CBQ_NAMELEN];

        struct workqueue_struct *cn_queue;

        struct list_head queue_list;

        spinlock_t queue_lock;

        int netlink_groups;

        struct sock *nls;

};

struct cn_callback_id {

        unsigned char name[CN_CBQ_NAMELEN];

        struct cb_id id;

};

struct cn_callback_data {

        void (*destruct_data) (void *);

        void *ddata;

        void *callback_priv;

        void (*callback) (void *);

        void *free;

};

struct cn_callback_entry {

        struct list_head callback_entry;

        struct cn_callback *cb;

        struct work_struct work;

        struct cn_queue_dev *pdev;

        struct cn_callback_id id;

        struct cn_callback_data data;

        int seq, group;

        struct sock *nls;

};

struct cn_ctl_entry {

        struct list_head notify_entry;

        struct cn_ctl_msg *msg;

};

struct cn_dev {

        struct cb_id id;

        u32 seq, groups;

        struct sock *nls;

        void (*input) (struct sk_buff *skb);

        struct cn_queue_dev *cbdev;

};

int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));

void cn_del_callback(struct cb_id *);

int cn_netlink_send(struct cn_msg *, u32, gfp_t);

int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));

void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);

struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);

void cn_queue_free_dev(struct cn_queue_dev *dev);

int cn_cb_equal(struct cb_id *, struct cb_id *);

void cn_queue_wrapper(struct work_struct *work);

extern int cn_already_initialized;

#endif                          /* __KERNEL__ */

#endif                          /* __CONNECTOR_H */